Acoustic radiation analysis of topographically optimized structure using the direct boundary element method

Abstract

A technique for controlling the noise radiation of folded plate structures is developed in this article. In this technique, the topography optimization method is introduced and an artificial parameter called [Formula: see text] is proposed as the objective function. The parameter [Formula: see text] is the upper bound of the surface velocity. The purpose of the optimization is to minimize [Formula: see text] while taking the surface velocities less than [Formula: see text] as the constraints. The infinite element method was applied to calculate the acoustic radiation pressure level. A numerical example of reducing the radiated noise of a folded plate structure using the proposed optimization technique is given. This article introduces the conjunction between the direct boundary element method and the infinite boundary method for acoustic radiation analysis of structures. The optimization results are quite encouraging and indicate that the design optimization technique developed in this article is pretty effective.